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Connective tissue nevi collagens. Study with picrosirius red and polarizing microscopy
H Trau1, D Dayan, A Hirschberg
1Department of Dermatology, Chaim Sheba Medical Center, Tel Aviv University, Israel.
The American Journal of Dermatopathology
|August 1, 1991
Summary
Collagenous connective tissue nevi show distinct collagen fiber patterns. Picrosirius red staining reveals less packed collagen in nevi compared to normal skin, aiding diagnosis.
Area of Science:
- Dermatopathology
- Connective Tissue Biology
- Histology
Background:
- Connective tissue nevi are benign neoplasms characterized by abnormal collagen organization.
- Differentiating these nevi from normal dermal collagen is crucial for accurate diagnosis.
Purpose of the Study:
- To investigate the collagen fiber characteristics in various types of connective tissue nevi.
- To evaluate the utility of Picrosirius red staining and polarization microscopy for diagnosing these conditions.
Main Methods:
- Biopsy specimens from five connective tissue nevi (solitary, Shagreen patch, erupted nevi) were analyzed.
- Sections were stained with Picrosirius red and examined under crossed polarized light.
Main Results:
- Thick and thin collagen fibers in connective tissue nevi consistently stained green to yellow.
- In contrast, normal human dermal collagen fibers appeared orange to red under the same conditions.
- This color difference indicates less densely packed collagen in the nevi.
Conclusions:
- Picrosirius red staining combined with polarization microscopy effectively differentiates collagenous connective tissue nevi from normal dermis.
- The observed polarization colors are indicative of altered collagen packing in these nevi, serving as a diagnostic tool.